![]() ![]() ![]() I then had two failures on 32 GB boot disks, the first paradoxically complaining that “updating requires 13.22 GB of disk space” when Disk Utility had just assured me that there was 13.32 GB available. I was foolish enough to believe that, so in the next run I tried a boot disk size of 32 GB, providing 13.32 GB of free disk space, as Disk Utility assured me. That was cancelled before it began, with the message that “updating requires 12.97 GB of disk space”. With a VM boot disk of 30 GB, there was only 11.19 GB of free space before downloading the update. FailuresĪll three failed updates were on VM boot disks of 30 and 32 GB total size, but the error messages given weren’t entirely helpful or consistent. The smallest VM boot disk that I was able to get to update to macOS 13.1 was 33 GB in total size, and provided 14.42 GB of free space for the download and update. Over the range of 30-40 GB total VM boot disk sizes that I tested, free space therefore ranged from 11.19-21.91 GB. Each VM boot disk lost a further 2.95-3.68 GB, presumably in hidden containers. Space taken by the SSV ranged from 8.83-10.14 GB, but that was offset by differences in the “other volumes”, making me suspicious that Disk Utility was still struggling with arithmetic. Successesįor a basic Ventura 13.0 system, the typical total space taken on disk by the boot volume group is around 15.14 GB, although variation in individual volumes is greater. Although the details are a bit noisier, the numbers work out reasonably consistent. It appears the only way to discover how much space is required is by trial and error, with a series of Virtual Machines. ![]() The download itself consistently declares that it’s 2.53 GB at least that’s a start, if not a particularly helpful one. Although that eventually links to advice on how to free up disk space when the update fails because there’s insufficient free space, nowhere can I see any figures indicating what is sufficient. The obvious place to check first is Apple’s support information about the 13.x updates. It seems a fair and simple question, and an important for many users: how much free space do you need on your Mac’s startup volume to be able to update macOS Ventura, say from 13.0 to 13.1? ![]()
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